<template>
    <div>
        <!-- 面包屑导航 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>商品管理</el-breadcrumb-item>
			<el-breadcrumb-item>添加商品</el-breadcrumb-item>
		</el-breadcrumb>
        <!-- 卡片视图区 -->
        <el-card>
            <!-- 提示 -->
            <el-alert title="添加商品信息" type="info" center="" class="el-icon-info" :closable="false"></el-alert>
            <!-- 步骤条 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
              <el-step title="基本信息"></el-step>
              <el-step title="商品参数"></el-step>
              <el-step title="商品属性"></el-step>
              <el-step title="商品图片"></el-step>
              <el-step title="商品内容"></el-step>
              <el-step title="完成"></el-step>
            </el-steps>
            <!-- tabs导航 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs :tab-position="tabPosition" v-model="activeIndex" :before-leave="beforeTabLeave"
                @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight" type="number">
                            <el-input v-model="addForm.goods_weight"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number" type="number">
                            <el-input v-model="addForm.goods_number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader :options="catalist" :props="cateProps" 
                            v-model="addForm.goods_cat" @change="handleChange" clearable>
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <el-form-item v-for="item in manyTableData" :key="item.attr_id" :label="item.attr_name">
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox v-for="(cb, i) in item.attr_vals" :label="cb" :key="i" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>

                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action 上传图片的api地址 -->
                        <el-upload
                        :action="uploadurl"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        :on-success="handleSuccess"
                        list-type="picture"
                        :headers="headerObj">
                            <el-button size="small" type="primary">点击上传</el-button>
                            <template #tip>
                                <div class="el-upload__tip">
                                    只能上传 jpg/png 文件，且不超过 500kb
                                </div>
                            </template>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本组件 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!-- 添加商品按钮 -->
                        <el-button type="primary" @click="add">商品按钮</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>    
        </el-card>
        <el-dialog title="预览图片"
        :visible.sync="previewDialogVisible"
        width="50%"
        >
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>
<script>
var _ = require('lodash')

export default {
    data(){
        return{
            // 步骤条  当前激活 索引
            activeIndex: '0',
            // tabs导航展示位置
            tabPosition: 'left',
            // 添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属的分类数组
                goods_cat: [],
                // 图片数组
                pics:[],
                // 商品的详情描述
                goods_introduce: '',
                // 动态参数和静态属性的合集数组
                attrs:[]
            },
            
            // 添加商品的表单验证规则
            addFormRules: {
                // 验证商品名称
				goods_name: [
                    { required: true, message: '请输入商品名称', trigger: 'blur' }, 
                    { min: 2, message: '至少2个字符', trigger: 'blur' }
                ],
                // 验证商品价格
				goods_price: [
                    { required: true, message: '请输入商品价格', trigger: 'blur' },
                ],
                // 验证商品重量
				goods_weight:  [
                    { required: true, message: '请输入商品重量', trigger: 'blur' },
                ],
                // 验证商品数量
				goods_number: [
                    { required: true, message: '请输入商品数量', trigger: 'blur' },
                ],
                goods_cat: [
                    { required: true, message: '请选择商品分类', trigger: 'blur' }
                ]
            },
            // 商品分类列表
            catalist:[],
            // 级联选择框的配置对象
            cateProps:{
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
                expandTrigger: 'hover'
            },
            // 动态参数列表
            manyTableData:[],
            // 静态属性列表
            onlyTableData:[],

            // 上传图片的api地址
            uploadurl: 'http://127.0.0.1:8888/api/private/v1/upload',
            // 上传图片的请求头对象
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            // 图片预览的路径
            previewPath: '',
            // 控制预览图片对话框的现隐
            previewDialogVisible: false
        }
    },
    created(){
        this.getCateList();
    },
    methods:{
        // 获取所有的商品分类
        async getCateList(){
            const { data:res } = await this.$http.get('categories');
            if(res.meta.status !== 200){
                return this.$message.error({
                    showClose: true,
                    message: '获取商品分类失败！'
                })
            }
            this.catalist = res.data;
        },
        // 级联选择框 值发生改变的时候，调用
        handleChange(){
            if(this.addForm.goods_cat.length != 3){
                this.addForm.goods_cat = [];
                return
            }
        },
        // 离开tabs之前会触发的函数
        beforeTabLeave(activeName, oldActiveName){
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                this.$message.error({
                    showClose: true,
                    message: '请选择商品分类！'
                })
                return false
            }else if(this.addForm.goods_name === ''){
                this.$message.error({
                    showClose: true,
                    message: '请填写商品名称！'
                })
                return false
            }
        },
        // 点击tabs会触发了函数
        async tabClicked(){
            if(this.activeIndex === '1'){
                // 证明访问的是动态参数面板
                const { data:res } = await this.$http.get(`categories/${this.cateId}/attributes`, 
                    {   params: {sel: 'many'} }
                );
                if(res.meta.status !== 200){
                    this.$message.error({
                        showClose: true,
                        message: '获取动态参数列表失败！'
                    })
                }
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                })
                this.manyTableData = res.data;
                console.log(res.data);
            } else if(this.activeIndex === '2'){
                const { data:res } = await this.$http.get(`categories/${this.cateId}/attributes`, 
                    {   params: {sel: 'only'} }
                );
                if(res.meta.status !== 200){
                    this.$message.error({
                        showClose: true,
                        message: '获取静态属性列表失败！'
                    })
                }
                this.onlyTableData = res.data;
            }   
        },
        // 点击图片预览
        handlePreview(file){
            console.log(file);
            this.previewPath = file.response.data.url;
            this.previewDialogVisible = true;
        },
        // 点击删除图片
        handleRemove(file){
            console.log(file.response);
            // 获取将要被删除的图片的路径
            const filePath = file.response.data.tmp_path;
            // 从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x =>x.pic === x.filePath);
            // 调用数组的  splice  方法，把图片信息对象从pics中移除
            this.addForm.pics.splice(i, 1);
        },
        // 监听图片上传成功的事件
        handleSuccess(response){
            // 拼接得到一个图片信息对象
            const picInfo = { 
                pic: response.data.tmp_path
            }

            // 将图片信息对象push到pics数组中
            this.addForm.pics.push(picInfo);
        },
        // 添加商品
        add(){
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) {
                    return this.$message.error({
                        showClose: true,
                        message: '请填写必要的表单项！'
                    })
                }
                // 执行添加的业务逻辑
                // console.log("添加");
                // 处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(' ')
                    };
                    this.addForm.attrs.push(newInfo);
                })
                // 处理静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo);
                })
                // 由于级联选择器需要的是数组，而以下操作将数组变成了字符串，所以会报错
                // 解决办法：使用深拷贝 lodash cloneDeep(obj)
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                form.attrs = this.addForm.attrs;
                const { data:res } = await this.$http.post('goods', form)
                if(res.meta.status !== 201){
                    this.$message.error({
                        showClose: true,
                        message: '添加失败'
                    })
                }
                this.$message.success({
                    showClose: true,
                    message: '添加商品成功！'
                })
                this.$router.push('/goods');
            })
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2];
            }
            return null;
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin: 0 10px 0 0 !important;
}
.previewImg{
    width: 100%;
}
.el-button{
    margin-top: 15px;
}
</style>